I propose the following rule “The Modus Ponens”

Subrules to this rule are in Cause:,Effect:, format.  A Traveller may often, and only often, apply an effect due to a Cause.  If a Traveller applies the Effect of one Cause, e may not apply the Effect of any other Cause for a period of time specified by “often”.  “Due to a Cause” means Causes trigger effects.  In other words, a Cause has just happened when an Effect is applied. 

When a Traveller applies an effect, e must post an entry explaining the use of it to the blog.

Unless at least half the players voting for this proposal also post the following string: “Blank Slate”, add the following subrules to “The Modus Ponens”

Time Hop
Cause: This Traveller changes target event
Effect: This Traveller’s TL changes to targeted event’s TL

Unraveling Mechanism
Cause: This Traveller changes target Traveller’s formula
Effect: This Traveller gains 5 influence, then if able, targeted Traveller loses 4 influence.

Basic idea of this is many repeatable events, but only one may occur per a day to reduce game complexity.  Some subrules would also be chronocrimes (see: subrule2 when not targeting self).  Note the purpose of rule #1 is that if you are at an early timeline, and change it and a later timeline, it allows you to then move to that timeline.